Figure 8: External interference caused by other wireless appliances
3. How to reduce high channel utilization
Usually, channel saturates when utilization is between [40%, 50%]. In this range, wireless network is still
OK for most applications. But for latency-sensitive applications, such as VoIP, channel utilization above
30% may affect the user experience.
In general, the main methods to reduce high channel utilization are:
1. Reduce the number of total SSIDs
Each additional SSID in the wireless network will bring a lot of air interface overhead. For example, if an
SSID is enabled on an AP, the SSID has an own beacon frame plus its other management frames. The
expense of occupying the channel is about 3% at a data connection rate of 1 Mbps. If an AP enables 3
SSIDs, the expense of the 1Mbps data connection rate will rise to about 9%. When you continuously cover
the network, if the AP is in a contention collision domain with the co-channel AP, the channel utilization rate
will be as high as 27%.
In addition, another reason for reducing the number of SSIDs is that some clients cannot handle a large
amount of SSID information due to their own limitations. These devices may be locked during scanning a
large number of SSIDs, and results in an association failure with targeting wireless network.
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